Transformer.



M. O. TROY.

TRANSFORMER. APPLICATION FILED APB.28, 1908.

Pafiented Mar. 26, 1912.

lnvenifor mcrfifm wQTroy a Mir": cs airs r in ii .Jilfllidfi 1 ii. iiiii MATTHEW? O. TRUE", OE SCHENEGTAIDY, NEW YGRK, ASSIGNOR T0 GENERALELECTRIC j GUEE'EPAIQYZ, A CORPQYFJATIGET NEW FL *8 TRANSF'DRIWIEE.

Specification of Letters Patent.

Application filed April 538, 1808. Serial No.

T0 aZZ who, it only concern: I

Be it known that l, lllAT'iHllW O. T1201,

21- cil'izcn of tho Uuiier States, residing at Schenccludy, county ofFichenectady, State of New York lnu'e invented. ccriain new and useful:lillplfii'iillllifi in Transform ers, of which the followin)ccilica'rion.

' My invcnii to transformers, and more purliculzi liuinsiori'ners whichare used for consinnt ill 'lllililg-Clll'lill electric circuit and hi iils object an improvement in tho conscruction 0i such trans formers.Tllfrlw i ironsorners have con".- inonly been con. in the past with oslationory coil and a movable coil both influencing a magnetic corewhich is so arranged that there is o constant length oi path for themagnetic circuit. regardless of the position of the moving coil. Thismeans that at fnlldood. when lhc o coils are close together, the primarywinding will have to nuignciize a portion oil the core longer than isrequired for influencing the secondary winding, and home, a greatercore-loss than nccd'l'ul is lolicn 705* ll) irsnsformcr.

fin object of n'y invention is to decrease his excessivc o loss whichoccurs during full-load, whim i 'irociicnlly ihe normal operating cond':ion for these 'l'rnnsforiners.

Anollicr ohicc of my invention is to derQosc lhut porlio' of lhemagnetic circuit not rcquir-iwil 1 5 oi transformation, hut inscricdmore girl c rcscloncci and rims lo obtain om of rho great- :idvanlogcsoi a's vsicm roosisting: of ii constant potential iransioruicr andscpzirzilc regulating winsmil-current rciictive-coil.

For a 'l urihcr undc'sianding of my invention, refcrc icc may he had tothe accompanying: drawing, wherein the single figure illusirnlcs inelevation an embodiment of my invcnl-ion.

1 is an E-shapcd magnetic core having three uprightlcgs and a bottomportion joining the rhrco legs.

2 and 3 are coils surrounding the central log of the core, coil 2 beingshown asv stationary, and coil 3 as movable in the well known fashion;ono of the coils being the primary and l hc othcr ihc secondary of thetransformer. The movable coil 3 is fastened in the usual way to :i cord4:, which is fastened to one of which has attached to it by another cordend of a lever 55, the oihcr end' counter-holancing the weighl of t emovable, coil 3 for the purposes well undcrslcod lav those skilled inthe art. U

Attached to the movable coil 3, 1' have shown two magnetic members 7 and8, which move between the of the core, and form a closed magneticcircuit around the inovable coil. These incrz no magnetic members 7 and3 more Willi 'oovnlole coih and hencc, for a fol ion of the transformerwhen l in close proximity, the LUDPQL porl'ions of Zlie legs of the coreshove lah sc iv/o l-if)\2l3. incnilicrs will have SllnflSiil'ilililllF/no mug, tic fiurr passing through ihen'n since the reluctance; of theclosed circuit Foriu members i and 8 \villhcsomuchlc fl! licrelucizmccofthe shunt circuili which is j med or the upper core and ihe sin i willmean, then, that thcrc will he sulisiii lisilly no core-loss in thatportion of ihe crunsforincr corc not subjccicrl to llic magrn lhceflicicncv of lhe 'trra creased.- The portion oil lie n'uiguclic cirsocall also, that is not rcqu for fransl'ormotion purposes, but which isnicrely' inserted to giro reaciancc is idlc and only consumes cnc grwhcn ii is rcqnircd do so.

'V' hile l ha e shown onc form in which my invcnlio; may he carried oul.i do not i i i. lo iliis form, but sccl-t in lhc appended clzi'n'is incover all (hos!) forms in which my invention may he carried out. andwhich do not depart from ihe scope of my invenlion.

I What I claim as new. and desire lo secure by lieliers Polcni of theUnited linics. is,

1. In a. constant currenllrans'fm-merq a magnetic core. a sioi'ioniiryand a n'mmblc coil surrounding a portion of said corc and in inductiverelation to each other so that the core forms o magnetic circiiii forihc coils, and means for varying the reluctance of the magnetic circuilinvcrscly with tho transformer load.

2. lo. a constant current transformer. a. magnetic core 2i stalionm'yand a movable coil surrounding a portion of said core and in inductivelQlllllOl'l in each oihcr so that the core forms a mugnciic circuit forihc coils, and means for varying longzl'h of l-JQ the magnetic circuitinversely with ihe transformer loco.

3. In a constant current transformer, a magnetic core, a stationary anda movable coilsurroundin a portion of said core and in inductive reation to each other so that the core forms a '1 etic circuit forthecoils, and means for ecreasmg the leakage flux of the movable coil foran increasing a load on the transformer.

, stationary coil, a movable coil, a core and a movable magnetic memberdecreasing the length of the magnetic circuit for an increasedtransformer load.

6. In a constant-current transformer, an E's-shaped core, a stationarycoil surrounding v the central leg of said core, a movable coil 25.surrounding the central leg of the core, and

movable magnetic members movable longitudinally between the legs of thecore.

7 In a constant-current transformer, an

E-shaped core, stationary and movable coils surrounding the central legofsaid core and magnetic members movable longitudinally between the legsof-the core closing the magnetic circuit around the movable coil.

8. In a constant-current transformer, an E-shaped core, a stationary anda movable coil surrounding the central leg of the core and magneticmembers fastened to the movable coil closing the magnetic circuitbetween the legs of the core around the movable coil.

9. In aconstant-current transformer, an E-shaped core, a stationary anda movable coil surrounding the central leg of the core, magnetic membersfastened to the movable coil closing the magnetic circuit between thelegs of the core around the movable coil, and means forcounter-balancing the weight gf the core and the movable magneticmemers. In witness whereof, I have hereunto set my hand this 27th day ofApril, 1908. I

MATTHEW U. TROY,

Witnesses:

BENJAMIN B. HULL, HELEN @nrono,

